Method of manufacturing an expansion joint cover



May 16, 1967 H. L. PATRY ETAL 3,319,330

METHOD OF MANUFACTURNG AN EXPANSION JOINT COVER Filed Feb. 5, 1964 17 Sheets-Sheet l lJIl/ I I I I IIIIIIII I I IIL le o III/I `l\ FIG. 2.

l2 2o 2e 'B lo Harvey L.. Parry Frances J. Patry Ernest Patry d H. Blair Lamonf BY av/ AQ/ INVENTORS ATTORNEYS f May 16, 1967 Filed Feb. 5, 1964 FIG. 5B.

H. L. PATRY ETAL METHOD OF MANUFACTURING AN EXPANSION JOINT COVER 17 Sheets-Sheet 2 FIG. 7.

Fm. 5c.

Fue eo FIG. 5D.

FIG 6D INVENTORS Harvey L. Pofry Frances J. Parry Ernest Patry H. Blair Lamont ATTORNEYS May 16, 1967 H. L.. PATRY r-:TAL 3,319,330

METHOD OF' MANUFACTURING AN EXPANSION JOINT COVER Filed Feb. 5, 1964 l17 SheetS-Sheet 3 FIG. 5A.

INVENTORS Harvey L. Pofry Frances J. Patry Ernest Parry H. Blair lomonf ffw, Leeg WM ATTORNEYS May 16, 1967 H. l.. PATRY ETAI. 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Filed Feb. 5, 1964 17 Sheets-Sheet 4 UIIIIIHIIIIr FIG.

FIG. 8. lo? v INVENTORS Harvey L. Patry Frances J. Parry Ernest Pory vH. Blair Lamom` /Y/m/ @4MM ATTORNEYS May 16, 1967 H. L. PATRY ETAL 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER l Filed Feb. s, 1964l 17 sheets-sheet INVENTORS Harvey L. Patry Frances J. Pofry Ernest Patry l H. Blair Lamont l @m9 Mgew ATTORNEYS May 16, 1967 H. l.. PATRY ETAL 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Filed Feb. 5, 1964 17 Sheets-Sheet 6 INVENTORS Harvey L. Parry Frances J. Patry Ernest Parry H. Blair Lamont May 16, 1967 H. L.. PATRY ETAL 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER B@ H. Blair Lomonr @M3 ang ATTORNEYS May 16, 1967 H- L.. PATRY ETAL METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Filed Feb. 5, 1964 17 Sheebgheet g A? f "A A 2 Cx l or i w' l 'if w* E la. i d

INVENTORS HOO/ey L. Patry Frances J. Patry Ernest Parry H. Blair LamomL ATTORNEYS May N5, 1967 H. L. PATRY ETAL 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Ernesf Pofry H. Blair Lomon i ATTORNEYS May 16, 1967 H. 1 PATRY ETAL METHOD OF MANUFACTURING AN EXPANSION JOINT COVER 17 Sheets-sheet 1o Filed Feb. 5, 1964 w u T n M www m RIJ Wmhwwm m, Pu IPJmL G F LSPH F mmwm W H HHIM, 2 /f Onu f 7 H 1 W ATTORNEYS May 16 i967 H. l.. PATRY ETAL. 3,3930

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER 17 SheetsSheet l1 Filed Feb. 5, 1964 INVENTORS VVF-NHV@ L. Parry Frances J, Por'y Ernes Parry H. Blair Loman? A TT() (NE Y May 16, 1967 L.. PATRY ETAL METHOD OF MANUFACTURING AN vEXPANSION JOINT COVER Filed Feb. 5, 1964 FIG. 23.

Frances 17 Sheets-Sheet 12 INVENTORS.

HarveyI L. Pofry J. Parry Ernest Patry H. Bla ir Lamont TTORNEYS May 16, 1967 H. PATRY :a1-Al.. 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER INVENT ORS Harvey L. Patry Frances J. Parry Ernest Pairy H. Blair Lomon May 16, 1'967 H. L.. PATRY ETAL.

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER 17 Sheets-Sheet 14 Filed Feb. 5, 1964 ovOm INVENTORS Harvey L. Patry Frances Paf Ernest Parry H. Blair' Lamont BY 27W/ Mg,

ATTORNEYS May 16, 1967 H. L'. PATRY ETAL 3,319,330

METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Filed Feb. 5, 1964 l? SheetS-Sheet l5 \5 INVENTORS f 20.0 ne. 28A. 20w fgxsszzfx Ernest- Patry a H. Blair Lamont .mjlow ATTORNEYS May 16, 1967 H. 1 PATRY ETAL 3,319,330

METHOD OF MANUFACTURNG AN EXPANSION JOINT COVER Filed Feb. 5, 1964 1.7 Sheets-Sheet 16 FIG. 3l.

IOV 12V INV ENTORS Harvey L. Patry Fl G. 3 4. Frances J. Patry Ernest Parry Q H. Blair Lomonf m9 MP3,@

"ATTORNY'S May 16, 1967 METHOD OF MANUFACTURING AN EXPANSION JOINT COVER Filed Feb.

FIG. 35.

H. L. PATRY ETAL FIG. 36.

17 Sheets-Sheet 17 INVENTOIB Harvey L. Patry Frances J. Pary Ernes Parry H. Blair Lamont ATTORNEYS United States Patent 3,319,330 METHI) F MANUFACTURING AN EXPANSIN JOINT CVER Harvey IJ. Patry, Francis I. Patry, and Ernest Patry, Lewiston, and Harold Blair Lamont, Lincolnville, Maine, assignors to Lamont 8; Riley, Inc., Worcester,

Mass., a corporation of Massachusetts Filed Feb. 5, 1964, Ser. No. 342,766 4 Claims. (Cl. 29-436) rI`his invention relates to a method of manufacturing an expansion joint cover of the type often used in buildings and elsewhere. The expansion joint cover has been made the subject of a prior copending application of the present inventors, Ser. No. 72,179, led Nov. 28, 1960, entitled, Expansion Joints for Metal Panels, now United States Patent No. 3,123,188 granted, Mar. 3, 1964.

A primary object of this invention is to provide an improved method of manufacturing the aforesaid type of expansion joint cover.

Another object of this invention is the provision of a method of manufacturing an expansion joint cover at low cost.

Still another object of this invention is the provision of a method of joining metal strips to elastic members in a simple and efficient manner.

Another object of this invention is to provide a method of bending metal elements to a particular shape and then joining them to an elastic member.

Other objects of the invention will become apparent as this description proceeds.

Briefly speaking, the invention provides a method of producing two metal strips and feeding them side by side in parallel paths. During this feeding operation the strips are bent so that each has an elongated vertical portion connected at its lower end to an elongated horizontal portion. In addition there is a horizontal base portion whereby the two strips have a cross section as shown in FIGURE 3 of the drawings. An elongated strip of elastic material is fe-d on to the first-named horizontal portions but only after a suitable adhesive has been applied to the several portions of the various strips which will ultimately be brought into contact with cach other.

The elastic strip is bonded to said first-named horizontal portions by means of suitable rolls, and in this connection vertical guides are employed for guiding the elastic material so as to prevent the lower portion of the elastic material from coming into contact with and adhering to the vertical portions of the first-named metal strips.

At a later time the aforesaid vertical portions of the two strips are bent down so as to clamp the elastic material between said vertical portions and the first-named horizontal portions.

The method and machine will be described in more detail in conjunction with the following drawings.

In the drawings:

FIGURE 1 is a perspective view of an expansion joint of the type described in the aforesaid prior copending application, and is the expansion joint which is manufactured by the method and machine described in the present application.

FIGURE 2 is a cross-sectional view of the expansion joint cover of FIGURE 1.

FIGURE 3 shows one of the steps involved in making the expansion joint of FIGURE 2.

FIGURE 4 is a cross-sectional view showing another step in the manufacture of the expansion joint cover of FIGURE 2.

FIGURE 5 as used herein refers generically to FIG- ICC URES 5A, 5B, 5C, and 5D, as more fully explained in connection with FIGURE 7.

FIGURE 5A is a top view of part of the machine for making the joint of FIGURE 1.

FIGURE 5B is a top View of another part of the machine for making the joint of FIGURE 1.

FIGURE 5C is a top view of yet another part of the machine for making the joint of FIGURE 1.

FIGURE 5D is a top view of still another part of the machine for :making the joint of FIGURE 1.

FIGURE 6 as used herein refers generically to FIG- URES 6A, 6B, 6C, and 6D, as more fully explained in connection with FIGURE 7.

FIGURE 6A is a side view -of part of the machine for making the joint of FIGURE 1.

FIGURE 6B is a side view of another part of the machine for making the joint of FIGURE 1.

FIGURE 6C is a side view of yet another part of the machine for making the joint of FIGURE 1.

FIGURE 6D is a side view of still another part of the machine for making the joint of FIGURE 1.

FIGURE 7 shows how sheets 2, 3, 4, 5, 6, 7, 8 and 9 are placed together in order to illustrate FIGURE 5 and 6 in their entirety.

FIGURE 8 is a top view of the metal primer device 1137 of FIGURE 6A.

FIGURE 9 is a side View lof the metal primer device 167 of FIGURE 6A.

FIGURE 10 is a side view of the rst forming roll 114, taken along line 11i-1t) of FIGURE 6.

FIGURE 11 is a side view of the second forming roll of FIGURE 6.

FIGURE 12 is a. side view of the third forming roll 116 of FIGURE 6. l

FIGURE 13 is a side view of the fourth forming roll 117 of FIGURE 6.

FIGURE 14 is a side view of the fth forming roll 118 of FIGURE 6.

FIGURE 15 is a side View of the crimping wheels 124 of FIGURE 6.

FIGURE 15A is an end View of the crimping wheels of FIGURE 15.

FIGURE 16 illustrates the rst edging rolls 119, together with their wedge 136, of FIGURE 21.

FIGURE 17 illustrates the second edging rolls'120, together with their wedge 136, of FIGURE 21.

FIGURE 18 illustrates the third. edging rolls 121, together with their wedge 136, of FIGURE 21.

FIGURE 19 rillustrates the first finishing rolls 122 of FIGURE 6.

FIGURE 20 illustrates the second finishing rolls 123 of FIGURE 6. i

FIGURE 21 is a side View of the wedge 136 of FIG- URES 16, 17, 18.

FIGURE 22 is a top view of the wedge of FIGURE 21.

FIGURE 23 is an end View partly in section of the apparatus for applying adhesive to the elastomeric sheet 16.

FIGURE 24 is a cross-sectional view of FIGURE 23 taken along line 24--24- FIGURE 25 is a cross-secti-onal View of the apparatus of FIGURE 23 taken along line 25-25.

FIGURE 26 is an end view of the appartus of FIG- URE 23.

FIGURE 27 is a side view of the bonding device 131, together with the closing rolls 132 and the press rolls 133, all of FIGURE 6.

FIGURE 28 is a top view of the apparatus of FIG- URE 27. v

FIGURE 28A is a sectional View taken `along line 28A-28A of FIGURE 28.

FIGURE 29 is -a detail View of the bonding rolls 131 3 of FIGURE 6, and is a view along lines 29-29 of FIG- URE 27, but with certain parts such as the vertical part of strip 16 omitted.

FIGURE 30 is a detail view of the closing rolls 132 of FIGURE 6.

FIGURE 31 is a plan view of the adhesive applicator 125 (together with associated apparatus) of FIGURES and 6.

FIGURE 32 is a detail view of the adhesivt applicator per se of FIGURE 31.

FIGURE 33 is an end view of the squeegee rolls 222 of FIGURE 31.

FIGURE 34 is a side view of the device shown in FIGURE 33.

FIGURE 35 is a top view of four of the edging rolls together with the wedge.

FIGURE 36 is an end view of the apparatus of FIG- URE 35.

The expansion joint cover of FIGURE 1 is `described in detail in the aforesaid prior copending application. It comprises two metal sheets and 12, preferably of copper or similar rust-resistant material, which are bent to form sockets into which the elastic material 16 ts and. is preferably secured by means of a suitable adhesive. FIGURE 2 shows a cross-sectional view of FIGURE 1 and it is apparent that the metal strip 10 has the folded portions 22, 24 and 26 to form a socket between the members 24 and 26 to hold the end 18 of the elastic member 16. At the left end of FIGURE 2 it is noted that the elastic member 16 is clamped between the pieces of metal and 23a-25, the same as on the righthand side.

FIGURES 1 through 4 are diagrammatic only, it being understood that the elastic strip 16 is much wider in relation to the other Aparts than is shown. For example, strip 16 may be 5 inches while portion 2t) may be 1/2 inch.

In use, the elastic joint of FIGURES 1 and 2 has its metal strips 1t) and 12 respectively connected to two parts of a building or other structure which may move with reference to each other, and the elastic member 16 provides the necessary elasticity for expansion and contraction, all 4as described in our aforesaid prior -copending application.

The present invention deals particularly with the machine for and method of manufacturing the expansion joint of FIGURES 1 and 2 and in that connection reference will be made particularly to FIGURES 3 and 4. In FIGURE 3 the elongated sheet of elastic material is shown in cross-sectional form at 16, and below it appears two strips 10 and 12 in a preliminary stage of their bending operation.

As shown in FIGURE 4, `another step of the process includes lowering the strip 16 in the pocket created by strips 10 and 12, but only after the strips 10 and 12 have been coated with adhesive and dried 0n the faces which will contact the elastic material 16. The elastic material 16 is also coated with adhesive and dried on those portions which contact the strip portions 21B, 23, 24 and 26.

Following the step shown in FIGURE 4, the two members 20 and 26 are then bent over the top of the elastic strip 16 (to produce the complete unit of FIGURE 2) and since the two members 20 and 26 are coated with adhesive they hold the elastic material 16 partly by reason of the clamping ,action of the strips but mainly because of the adhesive action.

There follows a description of the machine which carries out the process which has been very briefly described in connection with FIGURES 2, 3 and 4.

In order fully to understand the machine and the drawings, it is desirable to fit eight of the sheets of patent drawings together as more fully illustrated in FIGURE 7. FIGURE 5 comprises four subgures, FIGURE 5A, FIGURE 5B, FIGURE 5C, and FIGURE 5D, which should be placed end to end in order to tit together and illustrate FIGURE 5 in its entirety as a single entity. Similarly, FIGURE 6, which is a side view of the machine, comprises four suhtigures, FIGURE 6A, FIGURE 6B, FIGURE 6C and FIGURE 6D. The sheets of drawing containing these figures should be fitted together and placed directly under the corresponding drawings of FIGURE 5, because both FIGURE 5 and FIGURE 6 are to the same scale, and FIGURE 5, if properly aligned over FIGURE 6, shows a top view of the parts shown on FIGURE 6.

In order to provide information as to one size which our machine may take in a practical embodiment, we state: The length of the apparatus shown on FIGURE 6A is 16 feet, 6 inches; while the apparatus of FIGURES 6B, 6C and 6D is to a slightly smaller scale and the overall apparatus of `all three of these subgures is 50 feet.

Referring now to FIGURES 5 and 6, it is noted that at the start of the process there is a large coil of copper in strip form, this coil bearing reference numeral 1111 in FIGURE 6A. Actually there are two coils of this strip material as shown in FIGURE 5, one of which is the coil 111151 for supplying the copper strip which ends up as the strip 12 of FIGURE 2. The coil 1Mb supplies the strip which ends up las the strip 10 of FIGURE 2. Each coil 1111i of copper strip material has a suitable means 102 for adjusting the drag, and the copper strip emerges from the coil at 103 where it passes a guide 1134 and is subjected to cleaning by the wire brush 106 after it has had its direction changed by the wheel 195. Each wire brush 1116 only brushes about one inch of the strip adjacent the inner edge of the five inch strip 1113. The -one-inch portions subject to brushing are the portions 2(323 and 24-26 (FIGURE 4) to which adhesive is later applied. The copper strip after being brushed passes upwardly past the coating machine 107 which `applies a primer coat to the copper strip and then past the infra-red lamps 1118 for drying the primer coat, thence over the idler wheel 1119, next over the idler wheel 11%, and nally over the idler Wheels 112 and 111. The idler wheels 110, 111, and 112 are provided in substantially spaced relation, as shown, to provide additional time for the primer fully to dry before the next step of the process. Suitable additional guides such as 104a may be used where needed. The copper strip next passes the lubricating device 113 where it is given a suitable coating of wax, oil, or other solvent preparatory to the bending operations which will next be described.

Lubrication is applied for the well known purpose of enabling the forming rolls to slip with reference to the strip as the latter passes the rolls. Concurrently with application of the lubricant, the strips are guided in conventional manner by the guides 143 which may be adjusted transversely by cranks 144.

'Fhe copper strip passes through forming r-olls 114 to 123 inclusive, including the intermediate crimping device 124. These forming rolls as well as the crimping device are fully shown in detail in connection with FIGURES 10 to 20, to be described l-ater. It is suicient at this stage to point out that after each copper strip (111111 and 101b) has passed its respective set of rolls, it has been bent to the shape illustrated for parts 12-211 and 111-26 of FIGURE 3, as will appear later.

After leaving the finishing rolls 123, each strip Mila iand 101k then pases through the metal guider and coater 125 which applies a suitable contact cement or other adhesive to those particular surfaces of the metal which will subsequently `come in contact with the elastic material 16 (FIGURE 3). An example of suitable elastic materials, Contact cement, drying details, etc., are all covered in Military Specification 15,058-D (Types 3 and 4). In other words, referring to FIGURE 3, the porltions of the metal strips 10 and 12 which will be coated with adhesive will include the lefthand face of strip 26 and the upper face of strip 24; and the corresponding faces 20 and 23 of the element 12.

After the coated strips leave the element 125, they pass under the hot air outlets 126 where they are subjected to a suitable blast of hot air `for the purpose of partially drying the contact cement, and following this they pass through the air at room temperature, for a considerable distance, allowing t-he adhesive to further partially dry. Hot air is supplied to outlets 126 from a main hot air duct 126a.

While the aforesaid operations have been taking place, the supply -roll of elastic material 127 (see FIGURE 6A) has been feeding a stri-p of elastic material 16 past a coating device 12S which coats limited portions near the opposite edges with adhesive, following which the coated elastic strip 16 passes between the hot air outlets 129 so that the contact cement will partially dry. These outlets are fed by main hot air ducts 129a.

After leaving the hot air outlets 129, the coated elastic strip 16 passes over a pulley 130 and is directed toward the bonding machine 131. At this stage, the machine and method have brought the elastic strip 16 and the two metal strips y and 12 into the relationship shown in FIGURE 3, namely, the elastic strip is above the open pocket made up by the strips 10 and 12. The two faces of the strip 16, at least adjacent their opposite edges, have been coated with a suitable contact cement which has been partially dried, and similarly the strips 10 and 12 have been coated with contact cement which is partially dry on those surfaces which will contact the elastic strip 16. The bonding machine 131 will cause the elastic strip 16 physically to enter into the pocket in members 10 and 12, as shown in FIGURE 4, and thereafter the bonding rolls 132, together with the press rolls 133, 134, and .135, will clamp the members 20 and 26 onto the top of the elastic strip 16 to produce the product of FIG- URE 2.

FIGURES 8 and 9 illustrate the details of the primer coating device 107 of FIGURE 6. This primer coating device 107 simply comprises a pan 150 which is lled with a primer to a given level in any well-known manner, as Iby means of a bottle 151, and employs a brush 152 which feeds the primer by capillary action onto the strip 103 as it passes the same.

The rst set of rolls 114 of FIGURE 6 is shown in detail in FIGURE 10 where two forming rolls 114:1 and 1-14b form the strip 103 to the shape shown. Said rolls are driven by shafts 114C and 114d.

In each of the sets of forming rolls hereinafter described, there are shafts corresponding in function to shafts 114C and 114d, and since they have been described in connection with FIGURE l0, they will not be described in connection with the other figures.

The forming rolls 115 of FIGURE 11, the forming rolls 116 of FIGURE 12, the forming rolls 117 of FIG- URE 13 and the forming rolls 118 of FIGURE 14, apply progressively sharper bends to the strips 103 as shown.

Following forming rolls 118, each strip next passes through the crimping machine of FIGURE 15, however, the crimping operation is optional and may be omitted. The crimping machine comprises two spaced gear wheels positioned to apply crimping along the horizontal portion of the strips which later will become the portions 20 and 26 of FIGURE 3.

The edging rolls 119 (FIG. 16), 120 (FIG. 17), and 121 (FIG. 18), together with a suitable wedge 136, bend the strip 103 progressively as shown; and the iinishing rolls 122 (FIG. 19) and 123 (FIG. 20) eiect the nal bending operations preparatory to receiving the elastic material 16. The shape of the strip 103, when it is ready to receive the elastic material 16, is as shown in FIGS. 3 and 20; however, FIG. 3 shows the strip more accurately than FIG. 20 because the gap between portions 23 and is fully closed.

The wedge 136 is shown in more detail in FIGS. 21, 22, 35 and 36. The leading end (shown at the righthand end of FIGS. 21, 22, 35 and 36) of the wedge starts between the two edging rolls 119 of FIGS. 16 and 36. The wedge 136 continues and passes between the second set of edging rolls 120 of FIGS. 17, 35 and 36, and between the third set of edging rolls 121 of FIGS. 36 and 35, and it has a flange 136a located between rolls 121 (FIGS. 18, 35 and 36) and 122 (FIGS. 19, 35 and 36) to insure that the strip 103 is bent to the desired shape shown.

The iinishing rolls 122 and 123 of FIGS. 19 and 20 respectively accomplish the iinal bending operations to the shape shown in FIG. 20 (more -accurately shown in FIG. 3 as explained above).

While our invention includes as one element means for binding the metal strips 10 and 12 to the shape shown in FIG. 3, it is obvious to those skilled in the art of machinery for bending and forming strips how to do this with rolls and wedges, and -we do not claim that the specific details of the rolls and wedges 114-123 and 136 are part of our invention; but we do claim a larger machine in which any suitable means for performing the function of these rolls and wedges is an element of the combination.

FIGURE 23, together with detailed FIGURES 24 and 25, illustrate the details of the coating lmachine 128 of FIGURE 6. The sheet of elastic material 16 from the roll 127 has limited surface portions adjacent its opposite edges passing between rollers 161 and 164. The lower portions of the two rolls 161 pass through adhesive pans 170 where contact cement of any suitable type is picked up and fed into contact with limited portions of the lower surfaces of the sheet 16. In order to properly align the sheet 16 with the rolls, a pair of control rings 162 are positioned adjacent the rolls 161 and have slightly larger diameter than the rolls 161, whereby the sheet 16 must remain between the two rings 162.

In order to coat limited portions of the upper surfaces of the strip 16, adhesive must be transferred from the pans to the rollers 164. This is done by means of the pick-up rings 166.

In order to regulate the quantity of adhesive fed to the upper and lower surfaces of the strip 16, the scraping devices 167 and 168 are employed in connection with the pickup ring 166 and the rolls 161. The Scrapers 167 and 168 are located in a horizontal plane above the adhesive pan 170 as shown in FIGURE 23, and have a detailed construction as shown in FIGURES 24 and 25. The Scrapers 167 and 16S are positioned very close to, -but not in actual contact with their respective rings 166 and rolls 161 so that only a limited amount of adhesive may lbe picked up and transmitted to the sheet 16. In order to prevent the adhesive from contacting portions of the sheet outside of the limited portions desired, the rolls 161 and 164 have anges 165 which pinch the sheet and prevent travel of cement past the pinched area.

Rollers 161 and 164 are respectively driven by shafts 173 and 174. The two shafts 173 and 174 are supported at their outer ends by bearingsl 173a and 174a and near their inner ends by bearings 180 and 181. Bearings 180 are xed in position whereby shaft 173 always rotates around a iixed axis while bearings 181 may move up and down between guides 182 (FIGURE 25). Springs bias the bearing downwardly. Bearings 174:1 pivot around the screws 163 to a limited extent so as to adjust automatically the relative position of rolls 164 for sheets 16 of different thicknesses. Bearing 174a has holes 183 to receive pivots 163. The supports 184 and 185 are of iixed position.

The sheet 16 is prevented from sagging in the middle by means of a suitable support together with rollers 169.

As many sets of supports and rollers 169 as are required for suitable support of sheet 16 may be used.

The bonding apparatus 131 of FIGURE 6D is shown in more detail in FIGURES 27 and 28 where the elastic strip 16 is shown approaching the main bonding wheel 200 and the copper strips 10 and 12 are shown approaching the bonding area through the guides 205. As shown in FIGURE 27, the elastic strip 16 is now guided by the 

1. THE METHOD OF MAKING AN ELASTIC JOINT MEMBER COMPRISING FORMING TWO STRIPS EACH STRIP HAVING A FIRST INTEGRAL PORTION WITH A SUPERIMPOSED SECOND INTEGRAL MIDDLE PORTION BENT BACK OVER A PART OF THE FIRST PORTION AND EACH STRIP HAVING A THIRD INTEGRAL PORTION EXTENDING TRANSVERSE TO THE SECOND PORTION INA DIRECTION AWAY FROM THE FIRST PORTION, POSITIONING SAID STRIPS WITH SAID THIRD PORTIONS FACING EEACH OTHER AND WITH THE TWO SECOND PORTIONS FORMING A PLATFORM BETWEEN THE THIRD PORTIONS, POSITIONING A STRIP OF ELASTIC MATERIAL ON SAID PLATFORM, AND BENDING THE THIRD PORTION ONTO THE ELASTIC MATERIAL TO CLAMP THE ELASTIC MATERIAL BETWEEN THE SECOND AND THIRD PORTIONS. 